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A Java API to generate highchart json on the server side.

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package nl.pvanassen.geckoboard.api.widget;

import java.util.LinkedList;
import java.util.List;

import nl.pvanassen.geckoboard.api.Push;
import nl.pvanassen.geckoboard.api.error.ValidationException;
import nl.pvanassen.geckoboard.api.json.common.GraphType;
import nl.pvanassen.geckoboard.api.json.common.LabelValueItem;

import com.google.gson.annotations.SerializedName;

/**
 * Element for submiting data to the funnel graph
 * http://www.geckoboard.com/developers/custom-widgets/widget-types/funnel-graph/
 *
 * @author Paul van Assen
 */
public class FunnelGraph extends Push {

    @SerializedName("item")
    private final List items = new LinkedList();

    @SerializedName("type")
    private final GraphType graphType;

    private final String percentage;

    public FunnelGraph(String widgetKey, boolean showPercentage) {
        this(widgetKey, GraphType.STANDARD, showPercentage);
    }

    public FunnelGraph(String widgetKey, GraphType graphType, boolean showPercentage) {
        super(widgetKey);
        this.graphType = graphType;
        if (showPercentage) {
            percentage = "show";
        }
        else {
            percentage = "hide";
        }
    }

    public void addData(String label, String value) {
        items.add(new LabelValueItem(label, value));
    }

    @Override
    protected void validate() throws ValidationException {
        if (items.size() == 0) {
            throw new ValidationException("item", "Items cannot be empty");
        }
        if (graphType == null) {
            throw new ValidationException("graphType", "Cannot be null");
        }
        if (percentage == null) {
            throw new ValidationException("percentage", "Cannot be null");
        }
    }
}